SSRF in Kanbn Kan
CVE-2026-110628
Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@leediay/HyIxU63ofg (third-party-advisory)
- github.com/kanbn/kan/pull/590 (issue-tracking, patch)
- github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts (technical-description)
- github.com/kanbn/kan/blob/v0.6.0/.env.example (technical-description)
- github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg (vendor-advisory)
- github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 (patch)
- github.com/kanbn/kan (product)
- www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-a… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110628?
- CVE-2026-110628 is a high-severity vulnerability in Kanbn Kan, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-10-14.
- How severe is CVE-2026-110628?
- High severity. CVSS v3 base score is 8.6 out of 10.